Photographer: Scott Barbour/Getty Images for the World Solar

Big Batteries, the Elusive Key to Clean Energy, Boomed in 2015

  • Energy Storage Association says capacity more than tripled
  • Industry added 221 megawatts of capacity, mostly by utilities

Large-scale energy-storage systems, long considered the elusive link to integrating solar and wind power into electric grids, are slowly becoming a reality.

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